* toplev.c (rest_of_compilation): Fix register_life_up_to_date

	* toplev.c (rest_of_compilation): Fix register_life_up_to_date
	handling; move unconditional splitting before mode switching.

	* i386.md (type): Add fistp type.
	(i387, length_attr, scheduling definitions): Handle this type.
	(fix_trunc?f?i2): Revamp to use mode switching.
	(fix_trunct?f?i_nonmemory, fix_trunc?f?i_memory): New patterns.
	* i386.h (fp_cw_mode): New enum
	(OPTIMIZE_MODE_SWITCHING, NUM_MODES_FOR_MODE_SWITCHING, MODE_NEEDED,
	MODE_PRIORITY_TO_MODE, ENUM_MODE_SET): New macros.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@44027 138bc75d-0d04-0410-961f-82ee72b054a4